1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip.h 8.2 (Berkeley) 6/1/94 34 * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $ 35 */ 36 37 #ifndef _NETINET_IP_H_ 38 #define _NETINET_IP_H_ 39 40 #ifndef _SYS_TYPES_H_ 41 #include <sys/types.h> 42 #endif 43 #ifndef _NETINET_IN_H_ 44 #include <netinet/in.h> 45 #endif 46 #ifndef _NETINET_IN_SYSTM_H_ 47 #include <netinet/in_systm.h> 48 #endif 49 #include <machine/endian.h> 50 51 /* 52 * Definitions for internet protocol version 4. 53 * Per RFC 791, September 1981. 54 */ 55 #define IPVERSION 4 56 57 /* 58 * Structure of an internet header, naked of options. 59 */ 60 struct ip { 61 #ifdef _IP_VHL 62 u_char ip_vhl; /* version << 4 | header length >> 2 */ 63 #elif _BYTE_ORDER == _LITTLE_ENDIAN 64 u_int ip_hl:4, /* header length */ 65 ip_v:4; /* version */ 66 #elif _BYTE_ORDER == _BIG_ENDIAN 67 u_int ip_v:4, /* version */ 68 ip_hl:4; /* header length */ 69 #else 70 #error "Byte order not implemented" 71 #endif 72 u_char ip_tos; /* type of service */ 73 u_short ip_len; /* total length */ 74 u_short ip_id; /* identification */ 75 u_short ip_off; /* fragment offset field */ 76 #define IP_RF 0x8000 /* reserved fragment flag */ 77 #define IP_DF 0x4000 /* dont fragment flag */ 78 #define IP_MF 0x2000 /* more fragments flag */ 79 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 80 u_char ip_ttl; /* time to live */ 81 u_char ip_p; /* protocol */ 82 u_short ip_sum; /* checksum */ 83 struct in_addr ip_src,ip_dst; /* source and dest address */ 84 }; 85 86 #ifdef _IP_VHL 87 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) 88 #define IP_VHL_HL(vhl) ((vhl) & 0x0f) 89 #define IP_VHL_V(vhl) ((vhl) >> 4) 90 #define IP_VHL_BORING 0x45 91 #endif 92 93 #define IP_MAXPACKET 65535 /* maximum packet size */ 94 95 /* 96 * Definitions for IP type of service (ip_tos) 97 */ 98 #define IPTOS_LOWDELAY 0x10 99 #define IPTOS_THROUGHPUT 0x08 100 #define IPTOS_RELIABILITY 0x04 101 #define IPTOS_MINCOST 0x02 102 #if 1 103 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 104 #define IPTOS_CE 0x01 /* congestion experienced */ 105 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 106 #endif 107 108 109 /* 110 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 111 */ 112 #define IPTOS_PREC_NETCONTROL 0xe0 113 #define IPTOS_PREC_INTERNETCONTROL 0xc0 114 #define IPTOS_PREC_CRITIC_ECP 0xa0 115 #define IPTOS_PREC_FLASHOVERRIDE 0x80 116 #define IPTOS_PREC_FLASH 0x60 117 #define IPTOS_PREC_IMMEDIATE 0x40 118 #define IPTOS_PREC_PRIORITY 0x20 119 #define IPTOS_PREC_ROUTINE 0x00 120 121 /* 122 * ECN (Explicit Congestion Notification) codepoints in RFC3168 123 * mapped to the lower 2 bits of the TOS field. 124 */ 125 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 126 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 127 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 128 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 129 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 130 131 /* 132 * Definitions for options. 133 */ 134 #define IPOPT_COPIED(o) ((o)&0x80) 135 #define IPOPT_CLASS(o) ((o)&0x60) 136 #define IPOPT_NUMBER(o) ((o)&0x1f) 137 138 #define IPOPT_CONTROL 0x00 139 #define IPOPT_RESERVED1 0x20 140 #define IPOPT_DEBMEAS 0x40 141 #define IPOPT_RESERVED2 0x60 142 143 #define IPOPT_EOL 0 /* end of option list */ 144 #define IPOPT_NOP 1 /* no operation */ 145 146 #define IPOPT_RR 7 /* record packet route */ 147 #define IPOPT_TS 68 /* timestamp */ 148 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 149 #define IPOPT_LSRR 131 /* loose source route */ 150 #define IPOPT_SATID 136 /* satnet id */ 151 #define IPOPT_SSRR 137 /* strict source route */ 152 #define IPOPT_RA 148 /* router alert */ 153 154 /* 155 * Offsets to fields in options other than EOL and NOP. 156 */ 157 #define IPOPT_OPTVAL 0 /* option ID */ 158 #define IPOPT_OLEN 1 /* option length */ 159 #define IPOPT_OFFSET 2 /* offset within option */ 160 #define IPOPT_MINOFF 4 /* min value of above */ 161 162 /* 163 * Time stamp option structure. 164 */ 165 struct ip_timestamp { 166 u_char ipt_code; /* IPOPT_TS */ 167 u_char ipt_len; /* size of structure (variable) */ 168 u_char ipt_ptr; /* index of current entry */ 169 #if _BYTE_ORDER == _LITTLE_ENDIAN 170 u_int ipt_flg:4, /* flags, see below */ 171 ipt_oflw:4; /* overflow counter */ 172 #elif _BYTE_ORDER == _BIG_ENDIAN 173 u_int ipt_oflw:4, /* overflow counter */ 174 ipt_flg:4; /* flags, see below */ 175 #else 176 #error "Byte order not implemented" 177 #endif 178 union ipt_timestamp { 179 n_long ipt_time[1]; 180 struct ipt_ta { 181 struct in_addr ipt_addr; 182 n_long ipt_time; 183 } ipt_ta[1]; 184 } ipt_timestamp; 185 }; 186 187 /* flag bits for ipt_flg */ 188 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 189 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 190 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 191 192 /* bits for security (not byte swapped) */ 193 #define IPOPT_SECUR_UNCLASS 0x0000 194 #define IPOPT_SECUR_CONFID 0xf135 195 #define IPOPT_SECUR_EFTO 0x789a 196 #define IPOPT_SECUR_MMMM 0xbc4d 197 #define IPOPT_SECUR_RESTR 0xaf13 198 #define IPOPT_SECUR_SECRET 0xd788 199 #define IPOPT_SECUR_TOPSECRET 0x6bc5 200 201 /* 202 * Internet implementation parameters. 203 */ 204 #define MAXTTL 255 /* maximum time to live (seconds) */ 205 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 206 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 207 #define IPTTLDEC 1 /* subtracted when forwarding */ 208 209 #define IP_MSS 576 /* default maximum segment size */ 210 211 /* 212 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 213 * checksums. For the Internet checksum, struct ipovly can be used instead. 214 * For stronger checksums, the real thing must be used. 215 */ 216 struct ippseudo { 217 struct in_addr ippseudo_src; /* source internet address */ 218 struct in_addr ippseudo_dst; /* destination internet address */ 219 u_int8_t ippseudo_pad; /* pad, must be zero */ 220 u_int8_t ippseudo_p; /* protocol */ 221 u_int16_t ippseudo_len; /* protocol length */ 222 } __packed; 223 #endif 224